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Pakistan Journal of Biological Sciences
Year: 2001  |  Volume: 4  |  Issue: 6  |  Page No.: 757 - 761

Legume-bacterium (Rhizobium) Association-Symbiosis, A Marriage of Convenience, Necessary Evil or Bacterium Taken Hostage by the Legume

F. Azam    

Abstract: Nitrogen (N) is the key nutrient element, limiting crop production under most situations. A major reason for insufficient N supplies being its presence in soil in organic forms which must be mineralized before being used by the plants. However, leguminous plants are equipped with the facility to acquire a major portion of N directly from atmospheric N2 through bacterial fixation (reduction). The bacteria (Rhizobium spp) reside inside the special structures on plant roots i.e., nodules and reduce atmospheric N at the expense of C supplied by the plant. This paper presents an analysis of the nature of association between the legume and bacterium.

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